Automatic paper feed cutoff



Aug. 8, 1950 A. MARTELL 2,518,042

AUTOMATIC PAPER FEED CU'IOFF Filed May 13, 1947;

in mm I), i

- lllll n INVENTOR ALFONSO MARTELL.

ATTOR EY when the rock'shaft i'sstoppedi Patented Aug. 8, 1950 Z-a51a042 This 'invention'r'elates to printing presses and printed sheets contains a normally closed switch more particularly to attachments'fo'r printing foiiiprising a contact and a leaf spring biased presses having one or more printing: cylinders froin'the contactf'and'a feelerconnectedtdthe and means for conveying sheetsto and from the le'afspringand'adapted to be pressed beyond the cylinders; though it is noted that in some of the plane of the printed. sheetswhen no sheet is presclaims the invention is not lirnited to' printing fent, thereby toopen the switch. presses} jjlconducto rs;connect the switch and 'thecoil of One object offthe inventionisto: provide "an -the i'magnetinseries "circuit, whereby when no improved attachment of this kind which -autosheet is-present,-thswitch is opened, the; magnet matical ly' stops the feeding" means wlie'n the dee'rie'rgizeq;and the bolt, rockf'shaftandfeeding sheets are not properly delivered fromtheprint inechani'sn'i'stopped a, I a ing cylinders, 'thereby toprevnt injurvto th'e Inth'e 'acco'r'n anying'drawingfsh'owing, by way press or form and-waste of'paper.-' T of example; one oi; any possible embodiments of Other objects of the invention are to provide the invention 1 I an im roves-attachmen semis-ism which is Big. in fr'agniental somewhat diagrammatic adaptablefor difir'en't types of pre'sss, or'feed- 'sideele'vati'on of the printing press showing-the ing mean's andwhichmay be-"attached to presses j witch box and magnet support mounted: on the at different locationsfwhich willno'ti inter 'e rramebr the press; and j a I with the proper operationofth'epres's; Fig 2 is a fragmental sideblevatioh showing Additional objects of theinvention arertoerrmt 20 the" switch', magnet; plungerand; the mounting si'rnplicity and efiic'ier'icy in such attachments-and "eanS tIiereforQ a f f to provide "an" extremely simple"'attachnier it"' fy proved automatic paper feedc'utofiis thiskind"whichfisreliabl inbprati'iiiLeJSy' o o n "wayoffexample injcombination with operatean'd econrn'nical to i'rianufat n fa'p n ting press ll l having iinpres sio'n' cylinders stall. and ja' reversing cylinder IS threbetWe'en;

"it i's noted that the invention is suitable Still othr fobj'ec'ts ofthe-mventwnwil a a forsingle-cplinder and other types of presses or "as thede'scriptio'n proceeds; and while he tails of the inventionare-describ'edfi' 'fication and some of the claims, the invent'io described in the'broader lairnsi's' no it these, and many and" various';' changes- '5', ,;l rnounted on shafts l'l, I8 have app roxi njately horizontal upper courses receiving sheets a per'Zm one at a time, from the second cylin- I'nade without departing fr'orrifthes'cope 0 the 'd l2. A sheetfeeding mechanism 2! of the gen invention as claimed in the broader} brain-1 'eral character of that, shown in United States The inventive features forth" accomplishment 'Paten't; NQLQZOflQQ of Q. Christopher, issued of these and otherlobjects' are snowm n-ere in :35 'March115j1927 feeds the sheets to the first'cylin connection with an automatic paper fee'dcut off der fl] Said fe'eding mechanismjhas an auto-- attachment herein shown in'cornbiriat ma t -offdlevice including a norrnally oscilprinting press'h'aving printing cylinder I rock shaft 46 control means for stopping veyor means receiving snag-convene p inted the rock'shaft and means for stopping the feedsheets frorn the'cylinders;{- 'Ilie -p was an ing 'lrnechanisni whenever saidrockshaft 45 is provided with preyious'lv kno wr'i rnha Sm I -1i1 'ed. Only such part of said mechanism is feeding sheets to the cylinders "includin "shown asis necessary to show said rock shaft 5f,

shaft and means for: stopping tli Yhichis hereindesignated by. reference numeral l 6\, V V

My improved attachment compris a magnet 45 the press" herein shot/ 1 :11 provide a pair support adapted to be "mounted on' the press ,of brackets 23 secured on the printing press memframe'and supporting an"electromagnethav'ing a bers. 24 'a't' opposite sides of the press. c A rod 25 plunger bolt slidabl guided:infsaidrnagnet and "mountedin s'aidbracketsf23 transversely of the adapted when the magnt'is energizedto be'ivfith- 'jpr essl approximately over the discharge part of drawn toward the" rna'gnetu; A plung'efrod slid "the second printing roller 12 carries a bracket 26 ably reciprocatorily guided transverse-to he'end having a vertical bore 21 receiving a vertical rod of said bolt when 'retra'ctedisconnected O-"the TZFsecur d adjustably fast in saidvertical bore rock shaft and adapted to be stdr'ipdby-the bolt 21 byjm'e'ans' of a set screw 29; A magnet supwhen not retracted thereby to stop the rock "porti "comprising a rear wall 3l',"a floor 32' join- A switch box mounted under the fi iath bf the 5'5 "ing said, "wall and havingi-a -rectangular opening "iiiachinesg' E lndle ss tape's M mounted on rollers 33 near its mid-part, and a downturned flange 3 on the front edge of the floor provided with a round opening 35 near its mid-part, is provided on the rear face of the rear wall 35 with a lug 36 having a vertical bore 37 adjustably receiving said vertical rod 28 held fast therein by a setscrew 39.

A rectangular magnet frame 46 secured on said rear Wall has fixed tubular central vertical core M of magnetic material on which is received .a solenoid 42. A plunger core 43 slida-ble in said tubular core has a lower extension bolt 45 in said rectangular opening 33 and is adapted when the magnet is deenergized to extend below the .lleuel of the round opening 35 and when the magnet is energized to be Withdrawn above said ilevel "as shown at the dotted lines 45a.

A cover 41 for the magnet comprising integral side, top and front walls 49, 58, the lower-edge of the front wall 5| having small end notches 52, and therebetweena large middle notch '53 registering with said round opening 35. Clamping screws 54 in the downturnedfla-nges arereceived insaid small notches 52 and serve for clamping the cover 41 in place.

An oscillatory shaft 56 .mounted across the press over the second cylinder carries a :pair of upwardly pointing long and short lever arms .51, 58. A rocker arm 59 fast on said ,rockshaft 45 of the feedercut-oii' mechanism is connected by a link 50 to lever arm 51. A- horizontal plunger rod 6| is pivotedtothe otherarm and is reciprocator in said round opening 35 and middle notch 53, at all times out of contactwith said extension bolt 45 when the bolt is'retracted.

Said bolt when the magnet is deenergized ;is adapted to drop to the position shown and to stop said plunger rod, said rock shaft andsaid .feeding mechanism.

Abar 64 mounted between bearings ofsaid roller shafts l1, it between the planes-f ,the upper and lowercourses of the tapes I4 ,and between and remote from the right and .left marginal tapes supports a switch box 65 mounted fasten said bar between saidzcourses, the .upper ,part of the box being just under the plane of the upper course of tapes 1.4 and the sheetv 1.0 of paper carried thereon. A switch .66 in said box ,may he of any suitable type, for instance, the switch shown in United StatesPatent .No. 1,950,020 .issued May 22, 1934, to P. K. McGall, :and .comprises upperandlower fixed contacts 6. .1, 68 and a leaf spring -69 biased vfrcmiand movable to the lower contact .68. Conductors It, H, 12 connectsaidsolenoid42 and switch 66 in series he tweenthe terminal of .a suitable current source 13. An upright .rod M resting pnsaid leaf spring 69 engages under a feelersfinger J5 ipivotedat 16 in the upper part .of the switch box at the end nearest the printing cylinderssandis adapted, .to be pressed upwardly .by said rod and leaf spring beyond the plane of thesheet of paper .20, .When no sheet is present, thereby to. open the switch and deenergize the magnet, the finger being adapted to be pressed down bya sheet 2.0. when present .on the tapes over the switch, thereby to close the switch and energize the mag-net. Said switch 5.5 is in such a position under the sheets that in. normal operation a sheet .is over the switch .to depress the finger l5 and close the switch and energize the magnet and retract .the extension bolt 45 .at :the time that the plunger rod, BI is normally projected across the-path of thebolt; whereby :if a sheet Zil-should fail, to be .fed ,or should get wrapped around :a cylinder vpr 4 should for that or any other reason fail to be on the tapes l4 over the switch 56 when the plunger rod BI is about to be projected across the path of the bolt, the finger I5 will be raised, the switch opened, the magnet deenergized, the bolt 45 dropped and the plunger 6!, the rock shaft 46 and the feeding mechanism stopped, thus to prevent waste of paper or injury to the press.

The operation will be easily understood from thee-foregoing. The press isioperated'zin the ordinary way, the bolt 45 being held retracted by closing a starting switch 16 until a sheet is over the switch 65, closing the switch 66 and holding ethe bolt -45--retracted. Then the switch 15 is opened and the machine is continued in operation inthe ordinary way; but if for many reason asheet 20. should not appear over the switch, the switch will open and the feeding mechanism stopguntil the operation is corrected.

I claim as my invention:

.l. iAn attachment for use on a printing press having a printing cylinder, (conveyor means haw zing courses receiving printed sheets from the press; a,mechanism:for feedingsheets to the press,

. including an pscillatory-part and-means or stopping the mechanism when said part is stopped; said attachment comprising in combination a magnet; a guided plunger sbolt adapted when the magnet renergized'to be withdrawn toward the magnet; a plunger rod .slidably reciprocatorily guided transverse to said boltat theend of the bolt when the bolt isretracted, andeconnected .to said part and adaptedtobe stopped by the bolt when not retracted .-thereby to stop said part; a switch mounted-under the pathiof the printed sheets and connected in series" circuit with the magnet; a feeler connected :totthe switch and adapted to .be pressed-beyond the plane -of the printed sheets when no :sheet is present, thereby to open ithe'switch.

'2. An iattachmentfor use :on a printing press having a printing cylinder conveyor means having courses receiving printed sheets from the cylinder; a; mechanism for feeding sheets to the cylinder, including a rock shaft, and means forstopping the mechanism whenn-the rock shaft is stopped; said attachment comprising in .combination a magnet support ;v an electromagnet :on said'support; a plunger boltslidably guided said magnet and adapted when the magnet is energized :to be withdrawn toward the magnet; :a plunger rod :slidably reciprocatori-ly; guided transverse .to said bolt when .retracted and connectedwto therock shaft and adapted to be stopped by the bolt'when not retracted; a switch mounted under the path of the printed sheets and comprisingfa'contact and a leaf spring biased from the contact; .a source of current; conductors connecting the switch and magnet in series between the terminals of the source; a feeler connected-to the leaf spring and adapted to be pressed by the-spring beyond the plane of the ,printedsheets when ,nozsheet is present, thereby to open the switch, deenergize the -magnet and stop the .rockshaft.

v3. An attachment for use one. printing press having printing cylinders; tapes having horizontal courses receiving sheets from the cylinders a feeding mechanism for feeding-' sheets to the cylinders, including a rockshaft, and means for :stopping the mechanism whenever :said rock shaft is stopped; said attachment comprising incombination amagnet support-comprising a'floor having a rectangular opening and :a downwardfiange prwidedxwith-a :rdund opening; a magnet frame gamma tween said courses the box being'just'cu'n course; a switchin" contact and a leaf sp ng biase'd from the lower o current-1; conductors earpiece h' in-'serie' s "betwee'n the terminals of said "source; afi upright rod r'est ing on said leaf spring; andafee'ler fingee pivoted mule upper nter the switch bdx'jt the endnearestthe cylinders and adapted tob'e pressed upwardly by said"rod "and leaf spring beyond the plane of thesheetswhenrno sheet is present,

thereby to open the "switch" and'd'eenergize the magnet, whereby if a sheet'should fail to-be present over the switch when the p'lung'errodis about to be ise ted:'.= h finee -swi'l .sstaism the switch opened, and the roclr s h aft stopped. H 4. An attachment for use "'on a printin press having printing cylinders areversing r'oll therebetween; endless tapes-havinghorizontal courses reeciving sheets of paper frornthe second cylinder, and a feeding mechanisni h aying anauto 1 matic cut-off device including a"iiormally' os'cillatory rock shaft, control means for stopping the rock shaft, and means for stopping the mechanism whenever said rock shaft is stopped; said attachment comprising in combination a pair of brackets secured on the printing press frame at opposite sides of the frame; a rod mounted in said brackets transversely of the press over the second printing roller; a bracket mounted on said rod and having a vertical bore; a vertical rod secured adjustably fast in the vertical bore; a magnet support comprising a rear wall, a floor joining said wall and having a rectangular opening near its mid-part, and a downturned flange on the front edge of the floor provided witha round opening near its mid-part; the rear face of the rear wall having a lug having a vertical boreadjustably receiving said vertical rod fast therein; an electromagnet on said support; a plunger bolt slidably guided in said magnet and rectangular opening and adapted when the magnet is energized to be withdrawn toward the magnet; a plunger rod slidably reciprocatorily guided in said round opening transverse to said bolt when retracted and connected to the rock shaft and adapted to be stopped by the bolt when not retracted; a switch mounted under the path of the printed sheets and comprising a contact and a leaf spring biased from the contact; means connecting the switch and magnet coil in series circuit; a feeler connected to the leaf spring and adapted to be pressed beyond the plane of the printed sheets when no sheet is present, thereby to open the switch.

5. An attachment for use on a printing press having a printing cylinder; conveyor means having courses receiving printed sheets from the cylinder; av mechanism for feeding sheets to the cylinder, including a rock shaft, and means for stopping the mechanism when the rock shaft is stopped; said attachment comprisingin combination a magnet support having a rear wall, and a floor having a rectangular opening therein and a downturned flange having a round opening therein; a rectangular magnet frame secured on said-raf"wall' and liaving a fixed tubular central vertieai core; a: solenoidon said corexa plunger cdre 'slidab'lein said tubulari core and having 'a: lower extension "bolt in said rectangular opening and adapted-when the magnet is deenergize'dito extend below thelevel 0f the round opening and when 'the magnet'is energized-to be withdrawn above" said level; an' oscillatory 'shaf t1 mounted across the press and carrying a pairc of upwardly pointing lever arms; "a "rocker arm fast on said rock shaft o-f'the feeder cut-off mechanismlinked; to one of said'l'ev'er arms; a horizontal plunger rod pivoted to-'the other arm and slidably re cipro'cato-ry in said round opening. at all times out of contact withsaid bolt when'the coreretracted a cover -fo'r the inagn'et 'comprisingintegral side top andfront walls, the lower edge of the front wall having small end notches and therebetween Ia la'rge central notch receiving the plunger rod; clamping screws in the downturned flanges receivedin said small notches for clainpe ing the cover in place; a feeler fcr'feeling the sheets'in the conveyor means; and means operated"- by the fee'ler when a sheet is presentin' th'e'conveyor ineans toe'nergiz'e said magnet.

Sfr-An attachment-for use'on a printing; press having a printing cylinder-i "conveyor means havmg t'courses 'receivin'g" printed sheets fromthe cylinder; a mechanism for feeding sheets to the cylinder;i'includin'gr a rockishaft, and means for stopping the mechanisms when the rock shaft: is stopped;-" said: a.ttahr'n'ent'' comprising in com-- bination a magnet support; an electro-magnet on said support; a bolt slidably guided in said magnet and adapted when the magnet is energized to be withdrawn toward the magnet; a plunger rod slidably reciprocatorily guided transverse to said bolt when retracted and connected to the rock shaft and adapted to be stopped by the bolt when not retracted; a switch mounted under the path of the printed sheets and comprising contact and a leaf spring biased from the contact; a source of current; and a feeler connected to the leaf spring and adapted to be pressed beyond the plane of the printed sheets when no sheet is present, thereby to open the switch; said switch being in such a position under the sheets that in normal operation a sheet is over the switch to close the switch and energize the magnet and retract the bolt at the time that the plunger rod is normally projected across the path of the bolt; whereby if a sheet should fail to be fed or get wrapped around a cylinder and should for that or any other reason fail to be on the tapes over the switch when the plunger rod is about to be projected'across the path of the bolt, the finger will be raised, the switch opened, the magnet deenergized, the bolt dropped and the rock shaft stopped; thus to prevent waste of paper and injury to the press.

'7. An attachment for use on a printing press having a printing cylinder; conveyor means having courses receiving printed sheets from the cylinder; a mechanism for feeding sheets to the a cylinder, including a rock shaft, and means for stopping the mechanism when the rock shaft is stopped; said attachment comprising in eombina tion a magnet support; an electro-magnet on said support; a plunger bolt slidably guided in said magnet and adapted when the magnet is energized to be withdrawn toward the magnet; a plunger rod slidably reciprocatorily guided transverse to said bolt when retracted and connected to the rock shaft and adapted to be stopped by the bolt when not retracted; a switch box mounted: under themathoither printedasheets; aeswitch in; said box. comprising a:1owen contactandia leaf 'springibiasedifrom thezlower contact; ai/snurce ofi current; conductors-s connecting said solenoid andswitch: in. series between; the terminais: of said: source; anupright rod. restingsaid? leaf spring}. and;- a: feelerfingerpivoted in: the: upper part. of; the: switch box at-the end nearest the cylinders. and adapted to be pressed upwardlybysaidxrodand leaf spring beyond the planet of: the. sheets: when nosheet. is present thereby: to, open: the: switch and; deenergize: the. magnet, whereby a sheet should fail: to be present: over the-switch when the plunger-rod is. about: tdbe projected, the finger;- will bee-raised,- the. switch opened and the rock: shaft: stopped;

8;.An attachment: for-use on a printing presshavingeonveyon means having courses receivingi printed sheets from the press and. a feed: mechanismiforfeeding sheets to thepress includingran oscillatorypartz: and meansi'or stopping thezfeedfing; mechanism when the oscillatory part is, s-topped;saidi attachment comprisingzvin combinatiom. as magnet support; an electm-magnet: on said support; a-. guided: plunger of I magnetic. ma.- terial yieldably disposed in one position adjacent to'thesmagnet-andihavingarhoit part and adapted when the magnet is energized tobeattracted and drawn towardthe; magnetto: another position;. a plunger rodislidably reciprocatorily longie tudinally guidediin: a: pathtransverse to thegpath. of said: bolt. partand adapted. to: be: connected. to.

' plunger rod...

8;: theioscillatom part. to bee reciprocated. thereby; said-bolt pant: beingeconstructed; and' positioned to.. allow; the rod to move across its path: when theplunger; is in one: of. saidpositions of its v movement and. when i the plunger is inthe otherelectro-magnet and-plunger are .operatedtooause said bolts part to: move to, position to stop said ALEON REFERENGES CITED The following: references; are: of: record in the fii-e: of'tliist patentit.

UNITED STATES PATENTS Number. Name. Date 1,786,116. Kelly Dec. 23,1930

FOREIGN PATENTS Number I Country Date 475,601 Great Britain Nov. 23, 1937 

